A) 0
B) - 1
C) 2
D) 5
Correct Answer: B
Solution :
If \[\alpha \] is the coincident root, then \[{{\alpha }^{2}}+a\alpha +b=0\]and \[{{\alpha }^{2}}+b\alpha +a=0\] Þ \[\frac{{{\alpha }^{2}}}{{{a}^{2}}-{{b}^{2}}}=\frac{\alpha }{b-a}=\frac{1}{b-a}\] Þ\[{{\alpha }^{2}}=-(a+b);\alpha =1\,\,\Rightarrow -(a+b)=1\]Þ \[(a+b)=-1\].
You need to login to perform this action.
You will be redirected in
3 sec
